Cryptic crossword clue
& 18 Across Long-running show  song 3,5,2,2,1,11

The most common and most likely answer to this crossword clue is the 3 plus 5 plus 2 plus 2 plus 1 plus 11 letter word WHO WANTS TO BE A MILLIONAIRE

I've seen this crossword clue in The Daily Telegraph
W
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W
A
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Buddy explains!

The straight part
We know that "Long-running show/song" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case long-running show/song = who wants to be a millionaire.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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